package com.jl.security.checksum;

import com.jl.util.HexUtil;

public class ALG_ISO3309_CRC32 implements IChecksum {

	@Override
	public byte[] claculat(byte[] data, int form, int len, int baseValue) {
		CRC32 crc = new CRC32();
		crc.reset(baseValue & 0xFFFFFFFF);
		crc.update(data, form, len);
		long val = crc.getFinalCRC() & 0xFFFFFFFFL;
		return HexUtil.parseHexToByteArray(String.format("%08X", val));
	}

	private static class CRC32 {

		private int crc = 0;
		public static int crc32Table[] = { 0x00000000, 0x04c11db7, 0x09823b6e,
				0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
				0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 0x350c9b64,
				0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
				0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2,
				0x52568b75, 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
				0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, 0x9823b6e0,
				0x9ce2ab57, 0x91a18d8e, 0x95609039, 0x8b27c03c, 0x8fe6dd8b,
				0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef, 0xb7a96036,
				0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
				0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c,
				0xc3f706fb, 0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f,
				0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a,
				0xec7dd02d, 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
				0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, 0x128e9dcf,
				0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
				0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069,
				0x75d48dde, 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
				0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, 0x4d9b3063,
				0x495a2dd4, 0x44190b0d, 0x40d816ba, 0xaca5c697, 0xa864db20,
				0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc, 0xb6238b25,
				0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
				0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7,
				0xe4750050, 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c,
				0xfa325055, 0xfef34de2, 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31,
				0xcbffd686, 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
				0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 0x7a089632,
				0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
				0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4,
				0x51435d53, 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
				0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, 0x0315d626,
				0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, 0x1011a0fa, 0x14d0bd4d,
				0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60,
				0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
				0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a,
				0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9,
				0xb4bcb610, 0xb07daba7, 0xae3afba2, 0xaafbe615, 0xa7b8c0cc,
				0xa379dd7b, 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
				0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, 0x5d8a9099,
				0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
				0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f,
				0x76c15bf8, 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
				0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, 0x029f3d35,
				0x065e2082, 0x0b1d065b, 0x0fdc1bec, 0x3793a651, 0x3352bbe6,
				0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a, 0x2d15ebe3,
				0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
				0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1,
				0xe760d676, 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa,
				0xf9278673, 0xfde69bc4, 0x89b8fd09, 0x8d79e0be, 0x803ac667,
				0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
				0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, 0xbcb4666d,
				0xb8757bda, 0xb5365d03, 0xb1f740b4 };

		public CRC32() {
		}

		public int getFinalCRC() {
			return ~crc;
		}

		public void reset(int newCrc) {
			crc = newCrc;
		}

		public void update(int inCh) {
			int temp = (crc >> 24) ^ inCh;
			if (temp < 0) {
				temp = 256 + temp;
			}
			crc = (crc << 8) ^ CRC32.crc32Table[temp];
		}

		public void update(byte[] array, int off, int len) {
			for (int i = off; i < off + len; i++) {
				update(array[i]);
			}
		}

	}
}
